|Putting it up higher (say 6 inches above your computer instead of on the desk beside your monitor and tower) will help to reduce interference from the other nearby electronics and also potentially give a better line-of-sight between the mouse and receiver.|
Wrapping a wire around the receiver is basically a crappy version of soldering an antenna on.
All of the suggestions considered so far (yours and mine) are easy and cheap to try. Give each a shot, and see what helps...
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